/* =========================================================================
   style.css  —  Mengyue Wang / Terrain · Procedural TA
   -------------------------------------------------------------------------
   设计方向:冷静技术风 / 浅底 / 等高线签名元素 / 高程色带(低青→高金)
   你日常维护基本不用改这里。想调主色改最上面 :root 变量即可。
   ========================================================================= */

/* ---- 字体:Space Grotesk(标题) + IBM Plex Sans/Mono(正文/数据) ---- */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Sans+SC:wght@400;500&family=Space+Grotesk:wght@500;600;700&display=swap');


/* -------------------------------------------------------------------------
   1) 设计变量 —— 想换配色/尺寸只改这里
   ------------------------------------------------------------------------- */
:root {
  --paper:    #F2F3F0;   /* 测绘纸灰底(冷调,非暖奶油) */
  --paper-2:  #E9EBE6;   /* 略深的分区底 */
  --ink:      #1A1D1A;   /* 近黑正文 */
  --ink-dim:  #5C6360;   /* 次要文字(灰绿) */
  --contour:  #D4D8D2;   /* 等高线/网格线 */
  --line:     #CFD3CC;   /* 分隔线 */
  --elev-low: #2E5E5A;   /* 高程低处:深青(强调色/链接) */
  --elev-hi:  #C9A24B;   /* 高程高处:赭金(高亮) */
  --maxw:     1120px;

  --sans:  "IBM Plex Sans", "IBM Plex Sans SC", -apple-system, "Segoe UI", "PingFang SC", sans-serif;
  --disp:  "Space Grotesk", var(--sans);
  --mono:  "IBM Plex Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;
}


/* -------------------------------------------------------------------------
   2) 基础
   ------------------------------------------------------------------------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img, video { max-width: 100%; display: block; }

a { color: var(--elev-low); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 32px; }

/* 等宽小标签(eyebrow):像坐标/图层标签 —— 结构承载真实信息 */
.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--ink-dim);
}

/* 键盘可达性:可见焦点框(质量底线) */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--elev-low); outline-offset: 3px;
}


/* -------------------------------------------------------------------------
   3) 签名元素:等高线背景纹理
   用重复的径向/线性渐变画出"等高线"感,极淡,只在余光里成立。
   放在 body 的伪元素上,固定不滚动,再靠 JS 做极缓视差。
   ------------------------------------------------------------------------- */
.contour-bg {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    repeating-radial-gradient(circle at 88% 8%,
      transparent 0, transparent 70px, var(--contour) 70px, var(--contour) 71px, transparent 71px, transparent 142px);
  /* 只在右上角一小片山头,且极淡,往下用遮罩渐隐,不盖住卡片 */
  opacity: .18;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, #000 22%, transparent 52%);
          mask-image: linear-gradient(180deg, #000 0%, #000 22%, transparent 52%);
  will-change: transform;
}


/* -------------------------------------------------------------------------
   4) 导航栏
   ------------------------------------------------------------------------- */
header.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(242,243,240,.82);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav .logo { font-family: var(--disp); font-weight: 700; font-size: 17px; letter-spacing: .5px; color: var(--ink); }
.nav nav { display: flex; align-items: center; }
.nav nav a { margin-left: 26px; color: var(--ink-dim); font-size: 15px; }
.nav nav a:hover { color: var(--ink); text-decoration: none; }

.lang-btn {
  margin-left: 26px; padding: 5px 12px; cursor: pointer;
  background: transparent; border: 1px solid var(--line); border-radius: 4px;
  color: var(--ink-dim); font-family: var(--mono); font-size: 12px; letter-spacing: 1px;
}
.lang-btn:hover { color: var(--ink); border-color: var(--elev-low); }


/* -------------------------------------------------------------------------
   5) 首页 Hero
   ------------------------------------------------------------------------- */
.hero { padding: 110px 0 70px; }
.hero .eyebrow { display: block; margin-bottom: 22px; }
.hero h1 { font-family: var(--disp); font-size: 66px; line-height: 1.02;
           letter-spacing: -1.5px; font-weight: 700; }
.hero .sub { font-family: var(--disp); font-size: 24px; font-weight: 500;
             color: var(--elev-low); margin-top: 10px; }
.hero .thesis { font-size: 19px; color: var(--ink-dim); max-width: 560px; margin-top: 22px; }

/* 高程色带:低青→高金,一条细横线,呼应地形高程图 */
.elev-band { height: 4px; width: 240px; margin-top: 34px; border-radius: 2px;
             background: linear-gradient(90deg, var(--elev-low), #7FA05A, var(--elev-hi)); }

.hero .links { margin-top: 30px; display: flex; gap: 12px; flex-wrap: wrap; }
.hero .links a {
  font-family: var(--mono); font-size: 13px; letter-spacing: .5px;
  padding: 9px 16px; border: 1px solid var(--line); border-radius: 4px; color: var(--ink);
}
.hero .links a:hover { border-color: var(--elev-low); text-decoration: none; }


/* -------------------------------------------------------------------------
   6) 分区标题 + 等高线式分隔线
   ------------------------------------------------------------------------- */
.section-head { display: flex; align-items: baseline; gap: 16px; margin: 78px 0 28px; }
.section-head h2 { font-family: var(--disp); font-size: 15px; letter-spacing: 2px;
                   text-transform: uppercase; font-weight: 600; }
.contour-rule { flex: 1; height: 6px;
  background-image: repeating-linear-gradient(90deg,
    var(--line) 0, var(--line) 1px, transparent 1px, transparent 7px);
  align-self: center; }


/* -------------------------------------------------------------------------
   7) 项目卡片(悬停渗出高程色带)
   ------------------------------------------------------------------------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 26px; }
.card {
  position: relative; background: #fff; border: 1px solid var(--line);
  border-radius: 10px; overflow: hidden; transition: transform .28s, box-shadow .28s;
}
.card::before {   /* 左侧高程色带,默认收起,悬停渗出 */
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: linear-gradient(180deg, var(--elev-hi), var(--elev-low));
  transform: scaleX(0); transform-origin: left; transition: transform .28s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(26,29,26,.10); }
.card:hover::before { transform: scaleX(1); }
.card img { aspect-ratio: 16/10; object-fit: cover; width: 100%; background: var(--paper-2); }
.card .body { padding: 20px 22px; }
.card .body .idx { font-family: var(--mono); font-size: 11px; color: var(--ink-dim); letter-spacing: 1px; }
.card .body h3 { font-family: var(--disp); font-size: 20px; font-weight: 600; margin: 4px 0 8px; }
.card .body p  { color: var(--ink-dim); font-size: 14px; }
.card .body .tag { display:inline-block; margin-top:14px; font-family: var(--mono); font-size:11px;
                   color:var(--elev-low); border:1px solid var(--line); border-radius:3px; padding:3px 9px; }


/* -------------------------------------------------------------------------
   8) 项目详情页
   ------------------------------------------------------------------------- */
.project-header { padding: 80px 0 18px; }
.project-header .eyebrow { display:block; margin-bottom: 16px; }
.project-header h1 { font-family: var(--disp); font-size: 48px; letter-spacing: -1px; font-weight: 700; }
.project-header .meta { color: var(--ink-dim); margin-top: 12px; font-family: var(--mono); font-size: 14px; }

/* 项目信息条:角色 / 时间 / 工具,等宽字,像元数据 */
.project-facts { display: flex; flex-wrap: wrap; gap: 0 40px; margin: 26px 0 6px;
                 padding: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.project-facts .fact { }
.project-facts .k { display:block; font-family: var(--mono); font-size: 11px; letter-spacing: 1px;
                    text-transform: uppercase; color: var(--ink-dim); margin-bottom: 3px; }
.project-facts .v { font-family: var(--disp); font-size: 15px; font-weight: 500; }

/* 待填提示:醒目但克制,提醒你这里要补真内容 */
.todo { border-left: 3px solid var(--elev-hi); background: rgba(201,162,75,.07);
        padding: 12px 16px; margin: 20px 0; font-family: var(--mono); font-size: 13px; color: var(--ink-dim); }

.project-body { padding-bottom: 90px; }
.project-body h2 { font-family: var(--disp); font-size: 26px; font-weight: 600; margin: 52px 0 16px; }
.project-body p  { margin: 16px 0; color: #2C302C; }
.project-body img { border-radius: 8px; margin: 26px 0; border: 1px solid var(--line); }
.project-body ul { margin: 16px 0 16px 22px; color: #2C302C; }
.project-body li { margin: 7px 0; }


/* -------------------------------------------------------------------------
   8b) 多项目分节(PGT 页):项目块 / 编号头 / repo 链接 / 特性网格 / chips
   —— 沿用等高线/高程/等宽元数据母题,只在既有系统内扩展,不改上面任何类
   ------------------------------------------------------------------------- */

/* 项目块:块间用一条等高线式虚分隔线隔开,读起来像地形图分幅 */
.proj-block { padding-top: 46px; }
.proj-block + .proj-block { margin-top: 8px; }
.proj-block:not(:first-of-type) {
  border-top: 1px solid var(--line);
  margin-top: 40px;
}

/* 编号头:大号等宽序号 + 类型标签,序号真实承载"这是第几个项目"的信息 */
.proj-index { display: flex; align-items: baseline; gap: 14px; margin-bottom: 6px; }
.proj-index .n {
  font-family: var(--disp); font-weight: 700; font-size: 30px;
  line-height: 1; color: var(--elev-hi); letter-spacing: -1px;
}
.proj-index .of {
  font-family: var(--mono); font-size: 11px; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--ink-dim);
}
.proj-block h2 { margin-top: 4px; margin-bottom: 12px; }

/* 项目元数据条:repo 徽章 + 技术标签,一行等宽 */
.proj-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-bottom: 8px; }
.proj-meta .repo {
  font-family: var(--mono); font-size: 12px; letter-spacing: .5px;
  color: var(--elev-low); border: 1px solid var(--line); border-radius: 4px;
  padding: 5px 12px; transition: border-color .2s, background .2s;
}
.proj-meta .repo:hover { border-color: var(--elev-low); background: rgba(46,94,90,.06); text-decoration: none; }
.proj-meta .proj-tags { font-family: var(--mono); font-size: 12px; color: var(--ink-dim); }

/* 特性小标题:比 h2 轻,起分组作用 */
.feat-title { font-family: var(--disp); font-size: 17px; font-weight: 600;
              margin: 32px 0 14px; color: var(--ink); }

/* 特性网格:每项一个 key/value,像渲染管线/系统清单 —— 比长 ul 更有信息结构 */
.feat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px;
             background: var(--line); border: 1px solid var(--line);
             border-radius: 8px; overflow: hidden; margin: 8px 0 12px; }
.feat { background: #fff; padding: 16px 18px; }
.feat .feat-k {
  display: block; font-family: var(--mono); font-size: 11px; letter-spacing: .8px;
  text-transform: uppercase; color: var(--elev-low); margin-bottom: 6px;
}
.feat .feat-v { color: #2C302C; font-size: 14px; line-height: 1.6; }

/* chips:并排的小标签,用于后处理这类"一串特性名"的清单 */
.chips { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 4px; padding: 0; }
.chips li {
  font-family: var(--mono); font-size: 12px; color: var(--ink-dim);
  background: var(--paper-2); border: 1px solid var(--line);
  border-radius: 3px; padding: 5px 11px;
}

/* 团队项目里"我负责的部分":用高程色带左边框突出个人贡献 */
.proj-role { border-left: 3px solid var(--elev-low); background: rgba(46,94,90,.05);
             padding: 14px 18px; margin: 22px 0 10px; border-radius: 0 6px 6px 0; }
.proj-role .feat-k {
  display: block; font-family: var(--mono); font-size: 11px; letter-spacing: .8px;
  text-transform: uppercase; color: var(--elev-low); margin-bottom: 4px;
}
.proj-role p { margin: 2px 0; }


/* 图片画廊:等宽网格,配浅描边,用于角色设定/特效等成组图片 */
.img-grid { display: grid; gap: 14px; margin: 20px 0 8px; }
.img-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.img-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.img-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.img-grid figure { margin: 0; }
.img-grid img { width: 100%; aspect-ratio: 1/1; object-fit: contain;
                background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 8px; }
.img-grid.shots img { aspect-ratio: 16/10; object-fit: cover; padding: 0; }
/* dark:黑底技术图/数据图,深底 contain 不裁,消除白边违和 */
.img-grid.dark img { background: #14171A; aspect-ratio: 16/10; object-fit: contain; }
.img-grid figcaption { font-family: var(--mono); font-size: 11px; letter-spacing: .5px;
                       color: var(--ink-dim); text-align: center; margin-top: 8px; }

/* 单图配图注 */
figure.shot { margin: 26px 0; }
figure.shot img { margin: 0; }
figure.shot figcaption { font-family: var(--mono); font-size: 12px; color: var(--ink-dim); margin-top: 8px; }


/* -------------------------------------------------------------------------
   9) 视频播放器(YouTube / Bilibili 通用)
   ------------------------------------------------------------------------- */
.video { position: relative; width: 100%; aspect-ratio: 16/9; background: #000;
         border-radius: 8px; overflow: hidden; margin: 26px 0; border: 1px solid var(--line); }
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video-alt { font-family: var(--mono); font-size: 12px; color: var(--ink-dim); margin: -14px 0 26px; }


/* -------------------------------------------------------------------------
   10) About 页:左右分栏头像 + 技能横排5列
   ------------------------------------------------------------------------- */
.about-hero { display: grid; grid-template-columns: 300px 1fr; gap: 56px;
              align-items: center; padding: 84px 0 56px; }
.about-hero .portrait { width: 250px; height: 250px; border-radius: 8px;   /* 方形微圆角,更专业 */
              object-fit: cover; justify-self: center; border: 1px solid var(--line); }
.about-hero .eyebrow { display:block; margin-bottom: 14px; }
.about-hero h1 { font-family: var(--disp); font-size: 44px; letter-spacing: -1px; font-weight: 700; margin-bottom: 18px; }
.about-hero .titles { list-style: none; margin: 0 0 24px; display: flex; gap: 10px; flex-wrap: wrap; }
.about-hero .titles li { font-family: var(--mono); font-size: 13px; color: var(--elev-low);
                         border: 1px solid var(--line); border-radius: 3px; padding: 4px 10px; }
.about-hero .contact { color: var(--ink-dim); font-size: 15px; line-height: 1.9; }
.about-hero .contact a { color: var(--elev-low); }
.about-hero .contact .head { color: var(--ink); font-weight: 500; margin-top: 12px; }

.skills-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 30px;
              padding: 44px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.skill-col img { width: 44px; height: 44px; object-fit: contain; margin-bottom: 16px;
                 filter: grayscale(1) opacity(.85); }   /* 图标统一灰调,更冷静 */
.skill-col h3 { font-family: var(--disp); font-size: 16px; font-weight: 600; margin-bottom: 12px; }
.skill-col ul { list-style: none; color: var(--ink-dim); font-size: 13.5px; }
.skill-col li { margin: 6px 0; }

/* 教育/经历时间线 */
.timeline-item { border-left: 2px solid var(--line); padding: 2px 0 22px 22px; margin-left: 6px; position: relative; }
.timeline-item::before { content:""; position:absolute; left:-6px; top:8px; width:10px; height:10px;
                         border-radius:50%; background:var(--elev-low); }
.timeline-item h3 { font-family: var(--disp); font-size:18px; font-weight:600; }
.timeline-item .when { font-family: var(--mono); color: var(--ink-dim); font-size:13px; margin:3px 0 8px; }
.timeline-item p { color: var(--ink-dim); font-size:15px; margin:4px 0; }


/* -------------------------------------------------------------------------
   11) 页脚
   ------------------------------------------------------------------------- */
footer { border-top: 1px solid var(--line); padding: 44px 0; margin-top: 40px;
         color: var(--ink-dim); font-family: var(--mono); font-size: 13px; }


/* -------------------------------------------------------------------------
   12) 滚动淡入(克制)
   ------------------------------------------------------------------------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* 尊重"减少动态效果"系统偏好(质量底线) */
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .contour-bg { display: none; }
  * { scroll-behavior: auto !important; }
}


/* -------------------------------------------------------------------------
   13) 语言切换
   ------------------------------------------------------------------------- */
[data-lang="en"] .zh { display: none; }
[data-lang="zh"] .en { display: none; }


/* -------------------------------------------------------------------------
   14) 手机适配
   ------------------------------------------------------------------------- */
@media (max-width: 820px) {
  .hero h1 { font-size: 44px; }
  .hero { padding: 70px 0 50px; }
  .about-hero { grid-template-columns: 1fr; text-align: center; gap: 28px; }
  .about-hero .titles { justify-content: center; }
  .skills-row { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .project-header h1 { font-size: 34px; }
  .nav nav a { margin-left: 16px; font-size: 14px; }
  .feat-grid { grid-template-columns: 1fr; }
  .proj-index .n { font-size: 26px; }
  .img-grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .img-grid.cols-3 { grid-template-columns: repeat(2, 1fr); }
}